On March 31, the "Scaling Ethereum 2023" theme hackathon hosted by ETHGlobal officially ended.

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Snarky Monsters

Winning homepage:https://ethglobal.com/showcase/snarky-monsters-1 ei 3d

Snarky Monsters is a Pokémon-style on-chain game. The biggest feature of this game is "maximally on-chain", that is, maximally on-chain.

Currently, games that are fully on-chain run very slowly. In order to solve this problem, Snarky Monsters chose to perform calculations off-chain, and then verify them on-chain through zk proofs. By using cryptographic commitments to generate state channels of verifiable randomness, players of Snarky Monsters are able to interact with NPCs and other players with extremely low latency.

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ZKlinks

Winning homepage:https://ethglobal.com/showcase/zklinks-scalable-l2-referral-link-tracking-6 mna 3 

ZKlinks is a recommended link tracking system based on zero-knowledge proof. Compared with traditional services such as bit.ly, ZKlinks has the following advantages.

One is privacy protection. ZKlinks uses zero-knowledge proof to achieve stronger privacy. Traditional referral link tracking systems usually require users to share personal information such as their email addresses or social media accounts, while ZKlinks allows users to prove their referrals without revealing any personal information, which means users can refer friends and family , without worrying about their privacy being leaked.

The second is more secure. Traditional referral link tracking systems are often vulnerable to hacking and other security breaches, which may compromise the personal information of users and their referrals. By using a zero-knowledge proof system, ZKlinks can ensure that all referral data is secure and cannot be accessed by unauthorized parties.

Winning homepage:

Opclave

Winning homepage:https://ethglobal.com/showcase/opclave-94 def

Opclave is a smart contract wallet that does not require mnemonic phrases and supports Apple Face-ID and Touch-ID.

Opclave was developed by the Istanbul University İTÜ Blockchain Club team, with a total of 5 developers, one of whom is 0x Dogan.eth, one of the contributors to Connext Network. The core idea of ​​Opclave is to turn Apple devices, iPhones, and Macbooks into hardware wallets, and initiate transactions from the Apple Secure Enclave, a trusted execution environment, to ensure security. This wallet with biometric function not only simplifies the process of using the wallet, but also migrates the transaction experience from Web2 to Web3, which can increase the number of repeated use by users and attract more loyal users.

For more detailed information, please refer to: "Winning homepage:》

Polynote

Winning homepage:https://ethglobal.com/showcase/polynote-kbmcg

Polynote is a privacy-friendly document tool built on the Web3 database Polybase. Its text editor supports multiple functions such as image upload, important text highlighting, setting titles, and code blocks.

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SearchOS

Winning homepage:https://ethglobal.com/showcase/searchos-gxx 7 v

SearchOS is a Web3 search engine that allows users to easily interact with multiple applications across multiple chains, such as checking wallet balances and real-time prices on the Ethereum mainnet, Polygon, Gnosis Chain, or (cross-chain) sending, Bridge, trade tokens.

According to SearchOS, one of the current problems in the industry is that new websites, apps, and tools are introduced almost every day, and while this is the nature of the industry's evolution, it means users have to navigate through multiple menus and Only the interface can handle the daily Web3 business. This fragmented approach raises the entry threshold for new users.

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CFD DEX

Winning homepage:https://ethglobal.com/showcase/cfd-dex-and-flash-trillions-ad 666 

As the name suggests, CFD DEX is a decentralized exchange focused on contracts for difference (CFD).

A contract for difference is actually a contract on price difference concluded between a buyer and a seller. The contract stipulates that the seller pays the buyer the difference between the contract price and the settlement price of a commodity in cash (if the price difference is negative, you need to buy The whole process does not involve the transaction of the commodity entity, so it can also be said that this is an investment behavior completed by calculating the difference between the opening value and closing value of a certain commodity. The delivery in this process does not need to touch the subject matter itself at all, but just deliver their contracts. In order to achieve extremely efficient liquidation, CFD DEX will support the Flash Trillions function (see the name related to flash loans?), that is, to borrow a large amount of funds that do not even exist, all of which do not require any fees.

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Novusys

Winning homepage:https://ethglobal.com/showcase/novusys-ir 3 qq

Novusys is an account abstraction wallet service provider that integrates social signature function (implemented by using auth 0). The goal of Novusys is to provide an end-to-end Web3 wallet solution, which has the following three features:

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Moonboard

Winning homepage:https://ethglobal.com/showcase/moonboard-j 26 t 7 

Moonboard is a photo social platform aimed at helping interest discovery and early creative exposure.

At present, image social platforms like Pinterest mostly adopt an advertising-based revenue model, while Moonboard hopes to use Layer 2's advantages in small microtransactions to introduce micropayment incentive functions similar to Brave and Mirror on its platform , thereby encouraging the work of creators.

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Ethercard

Winning homepage:https://ethglobal.com/showcase/ethercard-zv 78 k

Ethercard, a physical card embedded with an NFC chip that connects to a user's cryptocurrency wallet, is a new payment solution that allows individuals and businesses to easily and securely receive cryptocurrency payments using NFC technology.

Ethercard uses zero-knowledge proofs and account abstraction to achieve its main functionality. By utilizing zero-knowledge proofs, Ethercard can allow storage of proof of ownership of private keys without storing the actual private keys in the NFC card, which would otherwise pose a huge security risk, even if users lose their encrypted debit cards, They can also cancel it like a bank card. By using the account abstraction, Ethercard is able to achieve two main goals, one is to leverage Paymaster to help pay for transactions, and the other is to create accounts that are not directly connected to the user's private key.

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ZKaptcha

Winning homepage:https://ethglobal.com/showcase/zkaptcha-4 q4 qz

ZKaptcha is positioned as the Cloudflare of the Web3 world, a verification code system based on zero-knowledge proofs. With ZKaptcha, DApp developers can protect their smart contract functions from bot interference.

The Web3 world is already infested with bots that interfere with the issuance of NFTs, token listings, airdrops... While traditional Web2 solutions like Cloudflare provide functionality to secure websites and other frontends, blockchains are exposed via RPC endpoints Access, so it is difficult to use verification codes to directly protect smart contracts, which is exactly the problem ZKaptcha hopes to solve. Here is a case where ZKaptcha comes into play.

Winning homepage:

Cove

Winning homepage:https://ethglobal.com/showcase/cove-8 ohfk

Cove aims to build simple, reliable, open-source contract verification for the Layer 2-centric Ethereum ecosystem. The current smart contract verification has a lot of room for improvement, and the existing problems include:

1. Validation fails frequently with no useful feedback on why it failed (over 200 validation issues in total);

2. Each Layer 2 chain has a different block explorer, which results in manual verification with each block validator;

3. The verified contract is not linked to Github, that is, it is difficult to verify whether the audited code is the actual deployment code, and it is also difficult to re-verify if the user does not trust the managed verification;

4. 1:1 mapping of verification providers to UI, anyone can start a novel front end to interact with smart contracts, but cannot view verified contracts;

Cove implements:

1. Stronger verification of all contracts;

2. Save the verified contract to a publicly available database;

3. Support other development frameworks, such as Hardhat and Ape;

4. Support other languages, such as Vyper and Huff;

5. Publish the Cove backend as a crate for easy local validation;

6. Multi-file verification logic sorting files;

7. Automatically verify on Etherscan and Sourcify after successful verification;

8. Support traditional authentication methods (such as standard JSON input);

9. Build a first-party UI to showcase Cove's capabilities.